[PATCH -next 2/2] virtio_net: Read the advised MTU

Michael S. Tsirkin
Thu, 02 Jun 2016 16:16:57 -0000

On Thu, Jun 02, 2016 at 11:43:31AM -0400, Aaron Conole
wrote:
> This patch checks the feature bit for the VIRTIO_NET_F_MTU feature. If it
> exists, read the advised MTU and use it.
>
> No proper error handling is provided for the case where a user changes the
> negotiated MTU. A future commit will add proper error handling. Instead, a
> warning is emitted if the guest changes the device MTU after previously
> being given advice.

I don't see a warning and I don't think it's needed.
Patch is ok commit log isn't.

> Signed-off-by: Aaron Conole <aconole at redhat.com>
> ---
>  drivers/net/virtio_net.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index e0638e5..ef5ee01 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1896,6 +1896,12 @@ static int virtnet_probe(struct virtio_device *vdev)
>  	if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
>  		vi->has_cvq = true;
>
> +	if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
> +		dev->mtu = virtio_cread16(vdev,
> +					  offsetof(struct virtio_net_config,
> +						   mtu));
> +	}
> +
>  	if (vi->any_header_sg)
>  		dev->needed_headroom = vi->hdr_len;
>
> @@ -2067,6 +2073,7 @@ static unsigned int features[] = {
>  	VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
>  	VIRTIO_NET_F_CTRL_MAC_ADDR,
>  	VIRTIO_F_ANY_LAYOUT,
> +	VIRTIO_NET_F_MTU,
>  };
>
>  static struct virtio_driver virtio_net_driver = {
> --
> 2.5.5